What is a ton timer

The TON function block is an ON delay timer that enables the “q” output a specific number of milliseconds after the trig input is enabled. … On the leading edge of this input, the output “q” will go high and the timer will start. When this input goes low, the “q” output will also go low.

A TON is a timer on delay and a TOF is a timer off delay. Both have EN bit, DN bit,TT bit. They both time to a preset. The differents between the two is TON times to on and the TOF times to off.

The RTO, also know as Retentive Timer, an instruction is used to keep track of time just like the TON Instruction. … The TON instruction will automatically reset the accumulated time upon a transition from HIGH to LOW. The RTO will simply “pause” the accumulated value during this transition.

The TON command is used as an output on a rung which, unlike the TOF command, is only active (counting) when the rung conditions are TRUE. The Enable and Done bits work the same as the TOF command, the Enable bit is set only when the rung conditions are FALSE and remains set until the rung goes TRUE.

TON Timer (On Delay Timer, or Delay Timer (TD))

The TD Timer Out bit turns ON when the timer has finished running. … When the current value of the timer reaches 0, and the timer’s input condition is still ON, the Timer Out bit turns ON. The Timer Out bit remains ON until the input condition falls (negative RLO).

Retentive refers to the device’s ability to remember its exact status such that when the circuit is again activated, the timer continues from the previous point. Non-retentive timers reset to zero and start from zero each time the timer function block is energized.